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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The draught may be produced by a

A steam jet
Chimney
All of these
Mechanical fan

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Steam Boilers, Engines, Nozzles and Turbines
A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as

Superheater
Injector
Economizer
Air-preheater

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Steam Boilers, Engines, Nozzles and Turbines
Fusible plug for boilers is made of fusible metal containing tin, lead, and

Aluminium
Nickel
Copper
Bismuth

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the actual vacuum to the ideal vacuum in a condenser is called

Boiler efficiency
Vacuum efficiency
Condenser efficiency
Nozzle efficiency

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Steam Boilers, Engines, Nozzles and Turbines
The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)

V = 44.72 K hd
V = 44.72 K hd
V = 44.72 K hd
V = 44.72 hd K

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following is a fire tube boiler?

Lancashire boiler
None of these
Babcock and Wilcox boiler
Yarrow boiler

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